Moment-angle relationship at lower limb joints during human walking at different velocities

Frigo, C.; Crenna, P.; Jensen, L.

doi:10.1016/1050-6411(96)00030-2

Cited by 117 publications

(95 citation statements)

References 23 publications

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“…The area between these loops were narrower when the speed change from slow to normal until it became zero and then the area increased more and more with increased speed. How to change in the rotation direction and area of the loops was corresponded with results of previous researches [4,5,6].…”

Section: Discussionsupporting

confidence: 70%

“…Many studies have been done on the biological human ankle and prosthesis replaced with this limb [2,4,6,7,9,10,14]. By plotting ankle angles versus ankle moment and analyzing them in healthy males, Frigo et al (1996) found that with an increase in walking velocity some of the loops narrowed and then changed from clockwise to counterclockwise.…”

Section: Introductionmentioning

confidence: 99%

“…By plotting ankle angles versus ankle moment and analyzing them in healthy males, Frigo et al (1996) found that with an increase in walking velocity some of the loops narrowed and then changed from clockwise to counterclockwise. They claimed that such behavior was reminiscent of a mechanical system with elastic components [4]. Palmer (2002) examined the dynamics of healthy, young subjects' ankle during walking at different self-selected speeds in his MS project.…”

Section: Introductionmentioning

confidence: 99%

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Power Assessment of the Human Ankle during the Stance Phase of Walking for Designing a Safe Active Prosthesis in Below-Knee Amputees

Soltani¹,

Esteki

2015

ACM

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Many studies have been done on the biological human ankle and prosthesis replaced with this limb. Although some of these works targeted to design a prosthesis which mimics the behavior of biological ankle, additional system is required to support the elastic components; any of them have obviously introduced an active system in designing ankle prosthesis until now. In this study the power of the non-disabled human ankle joint was examined during the stance phase of walking in sagittal plane. The study aimed to better understand the ankle's dynamic behavior for designing foot prosthesis with active mechanism. Kinematic and Kinetic data of the lower limb were collected from 18 healthy, young subjects (i.e. 6 females and 13 males) walking over a speed range of slow, normal and fast (i.e. 0.86 to 1.80 m/s). The ankle moment versus angle curves were plotted and total, mean and maximum values of powers were calculated for each trial. The results indicated that the total, mean and maximum values of the power could increase as the walking speed increased. The main findings of this study were the total, mean and maximum values of the power as a function of the linear velocity of walking. These results showed that the speed of 1.06 m/s was a critical velocity, below which the system was negative, showing energy consumer system, and above it the system was positive, suggesting generated energy. With the intent to design a prosthesis mimicking a biologic foot, an augmented system which is able to adjust the power to the speed is necessary.

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Section: Discussionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Power Assessment of the Human Ankle during the Stance Phase of Walking for Designing a Safe Active Prosthesis in Below-Knee Amputees

Soltani¹,

Esteki

2015

ACM

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“…If the norm of the total ankle torque and the total power for the three-dimensional model is compared with the two-dimensional one, the differences at some instances can be as big as 30% and 50% respectively. Two-dimensional foot models are commonly used in the literature due to the simplifications they bring for the kinematic and dynamic formulations, as well as the motion capture procedures [13,31]. This study shows that both the calculated ankle torques and powers could be very much affected by the dimension of the model.…”

Section: Ankle Dynamics and Energeticsmentioning

confidence: 92%

Effects of foot modelling on the human ankle kinematics and dynamics

Gholami

Vilà

Kövecses

et al. 2015

Mechanism and Machine Theory

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In this study, effects of some of the foot modelling assumptions on the ankle kinematics and dynamics are investigated based on the experimental data. For the kinematics analysis, the appropriateness of the stationary axis of rotation of the human ankle flexion is examined. Moreover, an interpolated function which is capable of predicting the directional changes of this axis is proposed. For the dynamics analysis, two main modelling assumptions of the number of the foot segments and the dimension of the foot model are the subject of the study. To this end, the ankle joint torque and power are selected as the comparison indicators and inverse dynamics analyses are carried out. The analyses show that the number of segments of the foot model does not have a considerable effect on the calculated ankle joint torque. On the other hand, the calculated ankle power is highly affected by both of the segmentation and the dimension of the foot model.

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“…Así, en el tobillo las curvas definen un lazo antihorario indicando que la musculatura plantarflexora sufre una contracción excéntrica, seguida por una contracción concéntrica, definiendo un área que crece a medida que la velocidad aumenta. Estos resultados están de acuerdo con estudios previos (Frigo et al 1996), e indican la necesidad de una mayor contribución activa de estos músculos a mayor velocidad de marcha. Por el contrario, en las articulaciones MT y MF el lazo descrito es horario, ya que se da una contracción concéntrica seguida por una excéntrica, definiendo un área que no se modifica apreciablemente con la velocidad.…”

Section: Capítulounclassified

Influencia de la postura del pie sobre la rigidez de la columna medial durante la marcha

Sales¹

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Als meus pares i al meu germà, sou i sereu el millor exemple AgradecimientosLlegados a este punto, es momento de dar las gracias a todas las personas que de una manera u otra han sido partícipes de que esta tesis llegue a buen puerto. Espero no olvidar a nadie.A mis directores, A Ximo por aceptar el reto de dirigir a un podólogo, por guiarme en todo momento, sobre todo cuando más perdido estaba, por enseñarme tanto durante este tiempo y por tu paciencia infinita. Sin ti no puedo imaginar esta tesis.A Javi, al que considero un referente en podología. Ha sido una suerte contar contigo en este proyecto.Agradecimiento muy especial a Alba, por tu trabajo en la implementación del modelo y tu ayuda y apoyos continuos durante todo el proceso de la tesis.A todos los sujetos que han participado en los experimentos. La realidad es que sin vuestros pies esta tesis no hubiera sido posible.Al grupo de investigación de Biomecánica y Ergonomía, por recibirme con los brazos abiertos desde el primer día.A mis compañeros de la Clínica Podológica de la Universitat de València. Trabajar con vosotros me hace crecer como podólogo.A mi familia. A mis padres, mi hermano y a Helena, por acompañarme y animarme en todo lo que hago. También sois parte de este trabajo. ResumenEsta tesis se presenta como un compendio de publicaciones encaminado a la caracterización de la dinámica de las articulaciones de la columna medial del pie (tobillo y articulaciones mediotarsiana y metatarsofalángica) con diferente índice postural.La revisión del estado del arte pone de manifiesto la escasez de trabajos que analicen las articulaciones del pie, más allá del tobillo, y que los existentes son poco sistemáticos debido a la complejidad del problema y con alta variabilidad en los resultados por su reducido tamaño muestral. Para reducir la complejidad, en otras articulaciones se ha propuesto el uso de la reducción dimensional o el estudio de la rigidez dinámica. Finalmente, es interesante estudiar la relación entre la postura estática del pie y la dinámica del pie durante la marcha, por la facilidad de uso en clínica de dicho indicador.La caracterización dinámica del pie con índice postural normal, altamente supinado y altamente pronado, se ha realizado atendiendo a diferentes métodos. En primer lugar se utiliza la representación tradicional de evolución temporal de rotaciones y momentos articulares en los tres planos de movimiento, arrojando intervalos de confianza más estrechos que los reportados previamente en la literatura. Asimismo se dan valores de los parámetros descriptivos de estas curvas, los cuales han permitido identificar tres patrones de marcha en pies con índice postural normal, y se proporcionan ecuaciones para su clasificación. En particular, se incide en la descripción de la articulación mediotarsiana, con curvas bastante diferentes en cada plano de movimiento, momentos dorsiflexores considerablemente mayores en el plano sagital, y rotaciones muy estables en los planos frontal y transverso durante el periodo de apoyo medio.La caracterización ...

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Moment-angle relationship at lower limb joints during human walking at different velocities

Cited by 117 publications

References 23 publications

Power Assessment of the Human Ankle during the Stance Phase of Walking for Designing a Safe Active Prosthesis in Below-Knee Amputees

Power Assessment of the Human Ankle during the Stance Phase of Walking for Designing a Safe Active Prosthesis in Below-Knee Amputees

Effects of foot modelling on the human ankle kinematics and dynamics

Influencia de la postura del pie sobre la rigidez de la columna medial durante la marcha

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